Screw-cutting tool



(No Model.)

Patented Pebgla, 18,83g

UNITED STATES PATENT OFFICE.

DARIUS HOUGHTON, OF SKOWHEGAN, MAINE.

SCREW-CUTTING TOOL.

SPECIFICATION forming part` of Letters Patent No. 272,139, dated February 13, 1883.

Application filed Augnst30,1882. (No mode1.)

To all whom it may concern:

Beit known that I, DARrUs HOUGHTON, a citizen ot' the United States, residing at Skowheg-nn, in the county of Somerset and State of Maine, have invented a new and useful Tool for Cutting Screws in Screw-Cutting Lathes, of which the following is a specicatien.

Figure 5 in the accompanying drawings represents the tool-post of a screw-cutting lathe with the cutting-tool attached. Fig. 4 is a side view of tool B in Fig. 5. Fig. 3 is a top view ot' the same. Fig. 1 is a side view of cutter O detached. Fig. 2 is a top view of the saine.

B in Fig. 5 has a slot or groove in top of sufficient depth and width to receive cutter C close tting. but loose enough to be easily moved. At D a taper-hole is made through B andcutter C, into which a taper-pin is driven tight-tittingin B,bnt loose in cutter O, forming hinge or pivot for cutter O, when cutting-point of O is lifted, as shown by dotted Iinesff.

The advantage of this tool is, when the lathe is reversed to run tool-post back, which has to be done a number of times to tinish a screw, there is n0 necessity of drawing toolpost back, as the pivoted cutter G easily lifts and prevents dragging against the work, While with solid cutter the tool-post must be drawn back every time the lathe is reversed, to prevent destroying the Work by the tool dragging.

What I claim as my invention is The combination of cutter O with the took holder B of a screw-cutting engine-lathe, in the manner and for the purpose herein described.

DARIUS HOUGHTON.

Witnesses:

W. F. BACON, F. A. NOLIN. 

